Battery cell, battery and power consumption apparatus
The present application discloses a battery cell, a battery and a power consumption apparatus. The battery cell may include: a housing filled with an electrolyte inside; at least one core assembly arranged in the housing and at least one closed liquid bladder holding another electrolyte, the liquid bladder being arranged in the housing, and at least being provided corresponding to a side wall of the core assembly; at least one weakened structure being provided on the liquid bladder. Under a condition that a pressure in the liquid bladder reaches a threshold value, the another electrolyte in the liquid bladder may break through the weakened structure and flow out of the liquid bladder.
1. A battery cell, comprising:
a housing, the housing being filled with an electrolyte inside;
a core assembly arranged in the housing; and
a closed liquid bladder holding another electrolyte, the closed liquid bladder being arranged in the housing and at least part of which is in contact with a side wall of the core assembly,
wherein the closed liquid bladder comprises a first liquid bladder and a second liquid bladder, and the first liquid bladder holds the another electrolyte, the second liquid bladder does not hold the another electrolyte, and the first liquid bladder and the second liquid bladder are isolated from each other in an initial state,
wherein a first weakened structure is provided between the first liquid bladder and the second liquid bladder for isolating them from each other, and when a pressure in the first liquid bladder reaches a first threshold value, the another electrolyte in the first liquid bladder breaks through the first weakened structure and flows into the second liquid bladder, and
wherein a second weakened structure is provided on the second liquid bladder, and when a pressure in the second liquid bladder reaches a second threshold value, the another electrolyte flowed into the second liquid bladder breaks through the second weakened structure and flows out of the second liquid bladder.
2. The battery cell according to claim 1 , wherein the side wall of the core assembly comprises a middle side wall portion located in a middle area of two end portions of the core assembly, and the closed liquid bladder is provided corresponding to the middle side wall portion.
3. The battery cell according to claim 1 , wherein the closed liquid bladder is provided between the core assembly and a side wall of the housing, and/or, the closed liquid bladder is provided between adjacent core assemblies.
4. The battery cell according to claim 1 , wherein the second weakened structure is provided at a part of an edge of the second liquid bladder.
5. The battery cell according to claim 4 , wherein the second weakened structure comprises a plurality of second weakened structures, which are spaced apart at the part of the edge of the second liquid bladder.
6. The battery cell according to claim 1 , wherein the battery cell comprises an upper end portion, the closed liquid bladder comprises an upper edge and a lower edge, and second weakened structure is located on a part of the upper edge of the second liquid bladder, the upper edge being closer to the upper end portion than the lower edge.
7. The battery cell according to claim 1 , wherein the second liquid bladder is located in an area of two end portions of the core assembly.
8. The battery cell according to claim 1 , wherein the second liquid bladder is located in an area not provided with a tab at an upper end portion of the core assembly.
9. The battery cell according to claim 1 , wherein the closed liquid bladder further comprises a buffer bladder and a third weakened structure which are provided between the first liquid bladder and the second liquid bladder, the first weakened structure isolates the first liquid bladder from the buffer bladder, and the third weakened structure isolates the buffer bladder from the second liquid bladder, and when a pressure in the buffer bladder reaches a third threshold value, the another electrolyte in the buffer bladder breaks through the third weakened structure and flows into the second liquid bladder.
10. The battery cell according to claim 9 , wherein the buffer bladder comprises a plurality of channels spaced apart from each other, one end of each of the plurality of channels is provided with the first weakened structure, and an other end of each of the plurality of channels is provided with the third weakened structure.
11. The battery cell according to claim 10 , wherein a volume of each of the plurality of channels is same or different.
12. The battery cell according to claim 9 , wherein
the closed liquid bladder comprises a plurality of first weakened structures, the first threshold value of each of the first weakened structures is same or different; and/or
the closed liquid bladder comprises a plurality of second weakened structures, the second threshold value of each of the second weakened structures is same or different; and/or
the closed liquid bladder comprises a plurality of third weakened structures, the third threshold value of each of the third weakened structures is same or different.
13. The battery cell according to claim 9 , wherein
the first weakened structure comprises at least one thinned area and/or an interlayer portion provided on the first liquid bladder; and/or
the second weakened structure and the third weakened structure each independently comprises at least one thinned area and/or an interlayer portion provided on the second liquid bladder.
14. The battery cell according to claim 9 , wherein the first threshold value, the second threshold value, and the third threshold value are each independently within a range between 0.1 MPa and 2.0 MPa.
15. A battery, comprising: a plurality of battery cells, wherein at least one of the plurality of battery cells is the battery cell according to claim 1 .
16. A power consumption apparatus, the power consumption apparatus comprising the battery according to claim 15 , and the battery being configured to provide electrical energy.